<?php

$LName = array();
$FName = array();

list($LName[0],$FName[0],$LName[1],$FName[1],$LName[2],$FName[2]) = 
      explode(" ","Crosby Bing, Gretzky Wayne, Clemente Roberto");

print_r($LName);

print_r($FName);

?>

Array
(
    [2] => Clemente
    [1] => Gretzky
    [0] => Crosby
)
Array
(
    [2] => Roberto
    [1] => Wayne,
    [0] => Bing,
)